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Rogue Engineering rear toe arms review
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11-29-2011, 11:05 PM | #45 | ||
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http://www.e90post.com/forums/showthread.php?t=235797 Quote:
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11-29-2011, 11:58 PM | #46 | |
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11-30-2011, 01:01 AM | #47 | |
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So I would say that in cases of "events" like the one you described, my car behaves well. The problems I detect in my car are: slight lack of accuracy in steering; lack of feel, or connectedness, going straightahead; and very slight wandering on bumpy freeways. Going straight ahead on a freeway, such as 280N from De Anza on, the steering wheel does not writhe and wiggle to communicate to me. There are events where it happens, but usually the steering is dead. On 101, which in my area is usually flat and smooth, steering is sharp and accurate. But on 280, which as you know is banked and filled with interesting bumps, the path the car takes wanders a slight amount. The weirdest and most annoying path accuracy problem is when I'm in a slight turn, and I can feel the step change in G force as the car decides on its own to tighten the turn ever so slightly. I am almost certain that compliance in the rear end is a contributor to all of these defects. But if changing the toe arm fixes them completely I will be pleasantly surprised. I fear that some of the ickiness is endemic to the front suspension design, and the design of the steering rack. I should say that in spite of these lingering problems, the car is so much more enjoyable to drive after the Bilsteins went in. The defects remain but the car is good enough now that I'm less annoyed with them.
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11-30-2011, 10:48 AM | #48 |
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[QUOTE=Thumperx;10892401]Under Suspension section, you'll find Mr.5's listing of springs types and rates:
http://www.e90post.com/forums/showthread.php?t=235797 Those rates aren't published by BMW just estimated by an enthusiast. I haven't seen anyone actually measure the spring rates of the BMW PS for the 335i and that's why I asked the question..
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11-30-2011, 12:11 PM | #49 | |
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Glad to hear it, and I agree with you about it being more enjoyable to drive. There's also way more room to make improvements.
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Last edited by Thumperx; 11-30-2011 at 12:21 PM.. |
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11-30-2011, 02:57 PM | #50 | ||
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I say this because it is a very common cognitive error to look at each mini-decision in isolation as if it exists alone. But we're buying this stuff to solve problems and we've spent thousands of dollars not hundreds. As much as I'd like to find out the pros and cons in the interests of Science, that is not the end goal. The end goal is to fix or mostly fix particular problems I experience. As a thought experiment: try iterating your recipe on every part in the car. That said I will probably end up buying the RE arm, as soon as I learn how its ball joints compare in design and function to the ball joints in the M3 factory toe arm. I corresponded with Ben Liaw but he is cagey. Quote:
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11-30-2011, 11:25 PM | #51 | ||||
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Whew, go for it.
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Last edited by Thumperx; 11-30-2011 at 11:30 PM.. |
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12-01-2011, 12:15 PM | #52 | |
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I hope you won't continue exhorting people to buy products after they've expressed interest in them.
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12-02-2011, 02:16 AM | #53 |
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Why does BMW engineer the toe arms to have so much deflection?
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12-02-2011, 02:43 AM | #54 |
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Because unlike on the M3, the 335i suspension was designed to offer decent comfort with RunFlat tyres. So as RFT are "harder" than conventional tyres, BMW softened the bushings to prevent an overly harsh ride.
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12-02-2011, 08:56 AM | #55 | |
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Here is my experience. 1) replaced the RFTs with non-RFTs - handling went for a crapper (front tires rolled over on hard cornering), ride was beautiful - using Dinan Stage 2 tune (still in warranty) - not happy 2) Change suspension - Dinan Stage 3 (springs shocks, front sway, camber plates), added front M3 tension and wishbones - handling very firm, much improved handling and performance - change tune to Procede, catless DPs, AR FMIC, DCI - somewhat happy. 3) change rear suspension - add subframe, M3 arms (upper and lower), rear sway, LSD - MUCH better handling, ride still f'n firm, add: Meth and Forged DVs - almost happy (happy with power) 4) add rear toe arms - car tracks straight where I point it - 90% at least, change to Procede 11-1 maps (power great) -HAPPY with whole package. The point being the entire car was designed for very firm side wall tires and you can't just change those - you have to redesign things to match them like the M3 has. It would be interesting to see how the M3 would drive with 480 ft/lbs of torque to contend with.
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12-02-2011, 09:05 AM | #56 | |
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Unfortunately it won't be until January that I'll have the toe links installed. But user impressions so far seem promising!
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12-02-2011, 10:48 AM | #57 |
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Cool. Once done, give us your thoughts.
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12-02-2011, 11:05 AM | #58 |
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12-02-2011, 12:13 PM | #59 |
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I agree that the rubber bushings are soft at least partly b/c of RFT (if there is some other reason I don't know what it is)... But, the arms themselves deflecting?
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12-02-2011, 12:58 PM | #60 |
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I'm guessing to promote understeer. A softer sprung rear should provide more grip.
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12-02-2011, 04:21 PM | #61 |
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I don't think the arms themselves are deflecting. Only the bushings. These suspension arms have to withstand shocks from driving over potholes etc. So I can't imagine they would "bend" under normal load conditions
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12-02-2011, 04:53 PM | #62 |
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Does seem weird doesn't it. But Harold says the arms do bend under load. He's quoted by CVC in a post above.
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Last edited by luckyu; 12-02-2011 at 05:09 PM.. Reason: to -> do |
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12-04-2011, 09:15 AM | #63 | |
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That is 90% gone now. By the way. I would only do these arms if you are experiencing torque steer or indirection on hard braking. If you don't, then I would skip the cost.
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12-04-2011, 12:08 PM | #64 |
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12-04-2011, 12:22 PM | #65 |
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Wow! Great thread...looking to do everything mentioned here, as well. Why Rogue? What happened to the other manufacturer? I must have missed it.
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12-04-2011, 03:04 PM | #66 | |
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Megan Racing also makes a toe arm for E9x.
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